Essays about: "expectation maximization"

Showing result 21 - 25 of 41 essays containing the words expectation maximization.

  1. 21. Volume calculation of the thyroid gland from SPECT images based on Monte Carlo simulations

    University essay from Umeå universitet/Radiofysik; Umeå universitet/Institutionen för fysik

    Author : Niklas Palmqvist; [2018]
    Keywords : nuclear medicine xeleris thyroid hyperthyroidism thyrotoxicosis monte carlo technetium iodine;

    Abstract : In this study the volume determination which is a part of the doseplanning for patients with thyrotoxicosis was investigated. The aim was to find an accurate method to determine the active volume with single photon emission tomography (SPECT) which in several studies have shown better results than with the currently used method planar scintigraphy (PS). READ MORE

  3. 22. OTDOA-Based Positioning in Narrowband IoT

    University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

    Author : Axel Berg; [2017]
    Keywords : IoT NB-IoT OTDOA Positioning; Technology and Engineering;

    Abstract : This thesis considers the problem of improving the performance of observed time difference of arrival (OTDOA) based positioning for Narrowband Internet of Things (NB-IoT). A new iterative low-complexity algorithm based on expectation maximization successive interference cancellation (EM-SIC) is presented. READ MORE

  4. 23. Application of new particle-based solutions to the Simultaneous Localization and Mapping (SLAM) problem

    University essay from KTH/Matematisk statistik

    Author : Xavier Svensson Depraetere; [2017]
    Keywords : ;

    Abstract :     In this thesis, we explore novel solutions to the Simultaneous Localization and Mapping (SLAM) problem based on particle filtering and smoothing methods. In essence, the SLAM problem constitutes of two interdependent tasks: map building and tracking. Three solution methods utilizing different smoothing techniques are explored. READ MORE

  5. 24. Return Rate Prediction

    University essay from Lunds universitet/Matematisk statistik

    Author : Erik Karlén; Caspar Welin; [2017]
    Keywords : Mathematics and Statistics;

    Abstract : Product quality is a major concern for all companies. Predicting the lifetime return rate allows for identification of products with atypically high return rates. Such products might otherwise not have been detected before it is too late to take any action to reduce the return rate. READ MORE

  6. 25. A Multi-Factor Stock Market Model with Regime-Switches, Student's T Margins, and Copula Dependencies

    University essay from Linköpings universitet/Produktionsekonomi

    Author : Adnan Berberovic; Alexander Eriksson; [2017]
    Keywords : finance; statistics; stock market; stocks; factor; factors; probability; probability distribution; students t distrbution; students t; copula; markov chain; hidden markov model; regime switching; stochastic programming; optimisation; optimization; multi factor model; arbitrage pricing theory; return; performance; back test; expectation maximisation; expectation maximization; multiple linear regression; stochastic process; primal-dual interior point; qq-plot; qq plot; excess return; market regimes; bear market; bull market; market index; index;

    Abstract : Investors constantly seek information that provides an edge over the market. One of the conventional methods is to find factors which can predict asset returns. In this study we improve the Fama and French Five-Factor model with Regime-Switches, student's t distributions and copula dependencies. READ MORE